I was hoping the same as you, and also went to the flea market to try there....my solution was exactly what you’ve said, to build a kind of open air market retail plot (used one in the middle of the dock area) and then when she’d raised enough cash to buy it I took her there to have a few days ‘at market’.
It worked pretty well for my story line - did get a weird effect where it looked like the surrounding whole area had been flooded while the market was open though! Also hadn’t thought it through properly about selling electronics outside without cover.....the storm didn’t go well :D